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A305318 Numbers k such that A071866(k)=3. 1
2, 3, 5, 6, 7, 10, 11, 12, 13, 17, 18, 20, 21, 24, 25, 26, 28, 29, 30, 33, 35, 36, 37, 41, 42, 43, 44, 45, 49, 50, 52, 53, 57, 58, 59, 60, 64, 65, 67, 69, 70, 73, 74, 78, 79, 81, 82, 83, 84, 87, 88, 89, 98, 99, 100, 104, 105, 109, 110, 111, 112, 113, 115, 116, 120, 121, 122, 125, 129, 130, 133 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are in A066940.  The first member of A066940 not in this sequence is 61.

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A000720(A275697(n+1)). - Robert Israel, May 31 2018

MAPLE

select(n -> nops(convert(ithprime(n+1)/ithprime(n), confrac))=3, [$1..1000]);

PROG

(PARI) isok(n) = length(contfrac(prime(n+1)/prime(n))) == 3; \\ Michel Marcus, May 31 2018

CROSSREFS

Cf. A000720, A066940, A071866, A275697.  Contains A029707.

Sequence in context: A024899 A114518 A066940 * A100118 A295389 A028781

Adjacent sequences:  A305315 A305316 A305317 * A305319 A305320 A305321

KEYWORD

nonn

AUTHOR

Robert Israel, May 29 2018

STATUS

approved

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Last modified July 5 01:22 EDT 2020. Contains 335457 sequences. (Running on oeis4.)